Addressing I/O and Controller Memory

4-21

 

 

Specifying Symbolic Addresses

When you specify symbolic address, follow these guidelines:

Start the name with an alphabetic character (not a number).

The symbol must begin with a letter and can contain as many as 10 of the following characters:

A-Z (upper and lower case)

0-9

underscore (_)

You can substitute a symbolic address for word or bit addresses.

IMPORTANT

Symbols are a feature of the programming software (not the controller) and are stored in a database on the hard disk of the personal computer you are using. If you use a terminal other than the one on which you defined the symbols, you will not have access to the symbol database.

Example

Logical Address

Symbolic Address

Input image

I:015/00

LS1

(bit)

I:015/03

AUTO1

 

I:015/06

SW1

Output image

O:013/00

M1

(bit)

O:013/02

CL1

 

O:013/04

L1

Word

F10:0

Calc_1

 

F10:1

Calc_2

Publication 1785-UM012D-EN-P - July 2005

Page 65
Image 65
Bradley Smoker PLC-5 user manual Specifying Symbolic Addresses, LS1, AUTO1, SW1, CL1